发明名称 |
Bandstop filters |
摘要 |
A filter network that exhibits a bandstop response comprises a network of basically low pass or high pass structure. The network is developed by choosing a bandstop transfer function, a fourth-orderelliptic is disclosed, which is converted to a low pass function. This function describes a passive low pass LC ladder network including a negative impedance element. A Bruton transformation is applied to the passive LC network to give an active version including an ungrounded negative resistance network in a series arm and frequency-dependent negative resistances in shunt arms without requiring inductance coils for its implementation.
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申请公布号 |
US4315229(A) |
申请公布日期 |
1982.02.09 |
申请号 |
US19800125049 |
申请日期 |
1980.02.27 |
申请人 |
THE POST OFFICE |
发明人 |
GREAVES, ALAN J.;GREENAWAY, PHILIP E.;NIGHTINGALE, CHARLES |
分类号 |
H03H11/10;H03H11/52;(IPC1-7):H03H11/04;H03H7/07 |
主分类号 |
H03H11/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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